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Impurities are fro the rock salt which is not a pure material; but table salt is purified up to 99 %.

Some impurities are added: iodate (or iodide) of potassium and anticaking agents.

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Q: Why impure salt is crushed when purification salt?
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Related questions

How do you purify salt to make it edible?

The refining of the impure salt involve filtration of the water solution and the purification by repeated processes of crystallization/recrystallization.


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